H - Electricity – 05 – G
Patent
H - Electricity
05
G
358/11.2
H05G 1/38 (2006.01) H05G 1/64 (2006.01)
Patent
CA 1050174
ABSTRACT: The invention relates to an X-ray installation which comprises a television display device and an auto- matic exposure device and in which dominant selection is no longer required. The television image produced during fluoroscopy is sub-divided into a large number of sub-fields, a storage position being assigned to each sub-field. In each storage position the part of the video signal is stored which corresponds to the assigned sub-field. The sub-fields are then determined which con- tain the regions of the maximum and the minimum bright- ness. An effective, organ-programmed intermediate value is derived therefrom. Moreover, the mean value of the video signal is obtained in the part of the television image assigned to the sole central measuring field of the automatic exposure device. The mean value is com- pared with the intermediate value, and the switch-off dose or switch-off voltage is corrected in dependence of the difference thus found.
247824
Lux Peter
Mollendorf Ralf
LandOfFree
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